<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Hello World!</title>
</head>
<body>
    <div id="id1">{{aaa}}</div>

    <script src="../lib/vue.min.js"></script>
    <script>
        var vm = new Vue({
            el: "#id1",
            data: {
                aaa: "hello world"
            }
        })
        
        setTimeout(()=>{
            vm.aaa = "2"
            console.log(vm.$data.aaa, vm.aaa)
        }, 2000)
    </script>
</body>
</html>